Direct Modulation/Waveform Generating,
6.1 GHz, Fractional-N Frequency Synthesizer
Data Sheet
ADF4158
FEATURES
GENERAL DESCRIPTION
Radio frequency (RF) bandwidth to 6.1 GHz
The ADF4158 is a 6.1 GHz, fractional-N frequency synthesizer
25-bit fixed modulus allows subhertz frequency resolution
Frequency and phase modulation capability
Sawtooth and triangular waveforms in the frequency domain
Parabolic ramp
Ramp superimposed with FSK
Ramp with 2 different sweep rates
Ramp delay
Ramp frequency readback
Ramp interruption
2.7 V to 3.3 V power supply
Separate VP allows extended tuning voltage
Programmable charge pump currents
3-wire serial interface
Digital lock detect
Power-down mode
Cycle slip reduction for faster lock times
Switched bandwidth fast lock mode
Qualified for automotive applications
with direct modulation and waveform generation capability. It
contains a 25-bit fixed modulus, allowing subhertz resolution at
6.1 GHz. It consists of a low noise digital phase frequency
detector (PFD), a precision charge pump, and a programmable
reference divider. There is a sigma-delta (Σ-Δ) based fractional
interpolator to allow programmable fractional-N division. The
INT and FRAC registers define an overall N-divider as N = INT +
(FRAC/225).
The ADF4158 can be used to implement frequency shift keying
(FSK) and phase shift keying (PSK) modulation. There are also
a number of frequency sweep modes available that generate
various waveforms in the frequency domain, for example,
sawtooth and triangular waveforms. The ADF4158 features
cycle slip reduction circuitry, which leads to faster lock times,
without the need for modifications to the loop filter.
Control of all on-chip registers is via a simple 3-wire interface.
The device operates with a power supply ranging from 2.7 V to
3.3 V and can be powered down when not in use.
APPLICATIONS
Frequency modulated continuous wave (FMCW) radar
Communications test equipment
FUNCTIONAL BLOCK DIAGRAM
AV
DV
V
R
SET
DD
DD
P
ADF4158
SW2
CP
REFERENCE
5-BIT
R-COUNTER
×2
REF
IN
DOUBLER
÷2
DIVIDER
+
PHASE
CHARGE
PUMP
FREQUENCY
DETECTOR
V
DD
–
HIGH-Z
CSR
DGND
LOCK
DETECT
SW1
FL SWITCH
O
OUTPUT
MUX
V
MUXOUT
CE
DD
R
DIV
DIV
N
RF
A
B
IN
N-COUNTER
TX
DATA
RF
IN
THIRD-ORDER
FRACTIONAL
INTERPOLATOR
CLK
MODULUS
25
2
FRACTION
REG
INTEGER
REG
32-BIT
DATA
REGISTER
DATA
LE
AGND
DGND
CPGND
Figure 1.
Rev. I
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